PAC07, Albuquerque, NM, June25-29, 2007 Fiber-Based Drive Laser Gain-switched seed ErYb-doped fiber amplifier Frequency-doubler 1560nm 780nm.

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Presentation transcript:

PAC07, Albuquerque, NM, June25-29, 2007 Fiber-Based Drive Laser Gain-switched seed ErYb-doped fiber amplifier Frequency-doubler 1560nm 780nm

PAC07, Albuquerque, NM, June25-29, 2007 Fiber-based Drive Laser e-bunch ~ 30 ps autocorrelator trace  CEBAF’s last laser!  Gain-switching better than modelocking; no phase lock problems, no feedback  Very high power  Telecom industry spurs growth, ensures availability  Useful because of superlattice photocathode (requires 780nm) Ti-sapp

PAC07, Albuquerque, NM, June25-29, 2007 Accelerator Downtime FY05Q4 – FY06Q3 Realign Ti-Sapphire lasers each week

PAC07, Albuquerque, NM, June25-29, 2007 Accelerator Downtime FY06Q4 – FY07Q3 Fiber-based lasers reduce downtime

PAC07, Albuquerque, NM, June25-29, 2007 Fiber-based Green Laser Development

PAC07, Albuquerque, NM, June25-29, W Fiber-based 1064um Laser from IPG

PAC07, Albuquerque, NM, June25-29, W Fiber Amp from IPG Order placed August 6 Delivery in 4 months (~ December)

PAC07, Albuquerque, NM, June25-29, 2007 JLab Advanced Drive Laser All solid, DPSS MOPA system high power, high rep. rate, short pulse laser Shukui Zhang, JLab FEL Picture here Oscillator: 1.064um 25ps/1W 75&750MHz Pre-amplifier plus 3 Power- amplifiers > > > M² <1.3 Pulse width: 25ps Beam size: 2mm Power stability: 0.5% Pointing stability: 20urad RMS timing jitter: 300fs *Reference: S.Zhang et al., Proced. 27 th International FEL conference, JACowW / eCon C , pp

PAC07, Albuquerque, NM, June25-29, 2007 JLab Advanced Drive Laser Schematic

PAC07, Albuquerque, NM, June25-29, 2007 JLab Advanced Drive Laser Schematic Replace with gain- switched diode seed laser Replace with fiber amp

PAC07, Albuquerque, NM, June25-29, 2007 What do we have to do? Purchase LBO frequency doubler (Shukui Zhang recommendation) Purchase different seed lasers, find one with narrow optical pulse Demonstrate 50W rf-pulsed output from IPG amp, with gain switched seed laser at nominal 499 MHz rep rate Characterize doubling efficiency vs repetition rate Explore different seed laser options, i.e., shorter input pulse. Goal: 25W at 532 nm? Locate suitable location at Hall C to conduct initial proof of principle tests (SLI monitor? per J. Benesch)